Finding the Fourth Proportional to 99,667.80, 137,540.70 and 54,346.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,667.80 : 137,540.70 = 54,346.50 : x
2. Step 2: Convert to fraction form
   99,667.80/137,540.70 = 54,346.50/x
3. Step 3: Cross multiply
   99,667.80x = 137,540.70 × 54,346.50
4. Step 4: Simplify right side
   99,667.80x = 7,474,855,652.55
5. Step 5: Solve for x
   x = 7,474,855,652.55/99,667.80
6. Step 6: Final answer
   x = 74,997.70