Finding the Fourth Proportional to 103,808.39, 143,255.57 and 56,061.72

Step by Step Solution

1. Step 1: Write the proportion equation
   103,808.39 : 143,255.57 = 56,061.72 : x
2. Step 2: Convert to fraction form
   103,808.39/143,255.57 = 56,061.72/x
3. Step 3: Cross multiply
   103,808.39x = 143,255.57 × 56,061.72
4. Step 4: Simplify right side
   103,808.39x = 8,031,153,373.47
5. Step 5: Solve for x
   x = 8,031,153,373.47/103,808.39
6. Step 6: Final answer
   x = 77,365.17