Finding the Fourth Proportional to 100,843.72, 139,162.98 and 56,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,843.72 : 139,162.98 = 56,131.72 : x
2. Step 2: Convert to fraction form
   100,843.72/139,162.98 = 56,131.72/x
3. Step 3: Cross multiply
   100,843.72x = 139,162.98 × 56,131.72
4. Step 4: Simplify right side
   100,843.72x = 7,811,457,427.73
5. Step 5: Solve for x
   x = 7,811,457,427.73/100,843.72
6. Step 6: Final answer
   x = 77,461.02