Finding the Fourth Proportional to 101,436.68, 139,981.28 and 56,111.06

Step by Step Solution

1. Step 1: Write the proportion equation
   101,436.68 : 139,981.28 = 56,111.06 : x
2. Step 2: Convert to fraction form
   101,436.68/139,981.28 = 56,111.06/x
3. Step 3: Cross multiply
   101,436.68x = 139,981.28 × 56,111.06
4. Step 4: Simplify right side
   101,436.68x = 7,854,498,000.96
5. Step 5: Solve for x
   x = 7,854,498,000.96/101,436.68
6. Step 6: Final answer
   x = 77,432.52