Finding the Fourth Proportional to 279,038,667.72, 385,070,305.68 and 153,588,181.50

Step by Step Solution

1. Step 1: Write the proportion equation
   279,038,667.72 : 385,070,305.68 = 153,588,181.50 : x
2. Step 2: Convert to fraction form
   279,038,667.72/385,070,305.68 = 153,588,181.50/x
3. Step 3: Cross multiply
   279,038,667.72x = 385,070,305.68 × 153,588,181.50
4. Step 4: Simplify right side
   279,038,667.72x = 59,142,247,999,040,320
5. Step 5: Solve for x
   x = 59,142,247,999,040,320/279,038,667.72
6. Step 6: Final answer
   x = 211,950,008.51