Finding the Fourth Proportional to 78,002.12, 107,642.52 and 42,192.02

Step by Step Solution

1. Step 1: Write the proportion equation
   78,002.12 : 107,642.52 = 42,192.02 : x
2. Step 2: Convert to fraction form
   78,002.12/107,642.52 = 42,192.02/x
3. Step 3: Cross multiply
   78,002.12x = 107,642.52 × 42,192.02
4. Step 4: Simplify right side
   78,002.12x = 4,541,655,356.69
5. Step 5: Solve for x
   x = 4,541,655,356.69/78,002.12
6. Step 6: Final answer
   x = 58,224.77