Finding the Fourth Proportional to 103,920.74, 143,410.59 and 56,174.06

Step by Step Solution

1. Step 1: Write the proportion equation
   103,920.74 : 143,410.59 = 56,174.06 : x
2. Step 2: Convert to fraction form
   103,920.74/143,410.59 = 56,174.06/x
3. Step 3: Cross multiply
   103,920.74x = 143,410.59 × 56,174.06
4. Step 4: Simplify right side
   103,920.74x = 8,055,955,087.30
5. Step 5: Solve for x
   x = 8,055,955,087.30/103,920.74
6. Step 6: Final answer
   x = 77,520.19