Finding the Fourth Proportional to 101,402.16, 139,939.56 and 56,690.16

Step by Step Solution

1. Step 1: Write the proportion equation
   101,402.16 : 139,939.56 = 56,690.16 : x
2. Step 2: Convert to fraction form
   101,402.16/139,939.56 = 56,690.16/x
3. Step 3: Cross multiply
   101,402.16x = 139,939.56 × 56,690.16
4. Step 4: Simplify right side
   101,402.16x = 7,933,196,046.73
5. Step 5: Solve for x
   x = 7,933,196,046.73/101,402.16
6. Step 6: Final answer
   x = 78,234.98