Finding the Fourth Proportional to 102,988.52, 142,105.32 and 57,667.20

Step by Step Solution

1. Step 1: Write the proportion equation
   102,988.52 : 142,105.32 = 57,667.20 : x
2. Step 2: Convert to fraction form
   102,988.52/142,105.32 = 57,667.20/x
3. Step 3: Cross multiply
   102,988.52x = 142,105.32 × 57,667.20
4. Step 4: Simplify right side
   102,988.52x = 8,194,815,909.50
5. Step 5: Solve for x
   x = 8,194,815,909.50/102,988.52
6. Step 6: Final answer
   x = 79,570.19