Finding the Fourth Proportional to 103,928.72, 143,421.57 and 56,182.15

Step by Step Solution

1. Step 1: Write the proportion equation
   103,928.72 : 143,421.57 = 56,182.15 : x
2. Step 2: Convert to fraction form
   103,928.72/143,421.57 = 56,182.15/x
3. Step 3: Cross multiply
   103,928.72x = 143,421.57 × 56,182.15
4. Step 4: Simplify right side
   103,928.72x = 8,057,732,338.25
5. Step 5: Solve for x
   x = 8,057,732,338.25/103,928.72
6. Step 6: Final answer
   x = 77,531.34