Finding the Fourth Proportional to 102,978.69, 142,103.72 and 57,649.02

Step by Step Solution

1. Step 1: Write the proportion equation
   102,978.69 : 142,103.72 = 57,649.02 : x
2. Step 2: Convert to fraction form
   102,978.69/142,103.72 = 57,649.02/x
3. Step 3: Cross multiply
   102,978.69x = 142,103.72 × 57,649.02
4. Step 4: Simplify right side
   102,978.69x = 8,192,139,908.11
5. Step 5: Solve for x
   x = 8,192,139,908.11/102,978.69
6. Step 6: Final answer
   x = 79,551.80