Finding the Fourth Proportional to 279,815.16, 386,145.42 and 152,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   279,815.16 : 386,145.42 = 152,490.72 : x
2. Step 2: Convert to fraction form
   279,815.16/386,145.42 = 152,490.72/x
3. Step 3: Cross multiply
   279,815.16x = 386,145.42 × 152,490.72
4. Step 4: Simplify right side
   279,815.16x = 58,883,593,120.50
5. Step 5: Solve for x
   x = 58,883,593,120.50/279,815.16
6. Step 6: Final answer
   x = 210,437.47