Finding the Fourth Proportional to 103,002.28, 142,147.20 and 57,679.86

Step by Step Solution

1. Step 1: Write the proportion equation
   103,002.28 : 142,147.20 = 57,679.86 : x
2. Step 2: Convert to fraction form
   103,002.28/142,147.20 = 57,679.86/x
3. Step 3: Cross multiply
   103,002.28x = 142,147.20 × 57,679.86
4. Step 4: Simplify right side
   103,002.28x = 8,199,030,595.39
5. Step 5: Solve for x
   x = 8,199,030,595.39/103,002.28
6. Step 6: Final answer
   x = 79,600.48