Finding the Fourth Proportional to 101,343.72, 139,854 and 56,631.72

Step by Step Solution

1. Step 1: Write the proportion equation
   101,343.72 : 139,854 = 56,631.72 : x
2. Step 2: Convert to fraction form
   101,343.72/139,854 = 56,631.72/x
3. Step 3: Cross multiply
   101,343.72x = 139,854 × 56,631.72
4. Step 4: Simplify right side
   101,343.72x = 7,920,172,568.88
5. Step 5: Solve for x
   x = 7,920,172,568.88/101,343.72
6. Step 6: Final answer
   x = 78,151.59