Finding the Fourth Proportional to 101,978.11, 140,752.38 and 56,671.71

Step by Step Solution

1. Step 1: Write the proportion equation
   101,978.11 : 140,752.38 = 56,671.71 : x
2. Step 2: Convert to fraction form
   101,978.11/140,752.38 = 56,671.71/x
3. Step 3: Cross multiply
   101,978.11x = 140,752.38 × 56,671.71
4. Step 4: Simplify right side
   101,978.11x = 7,976,678,061.17
5. Step 5: Solve for x
   x = 7,976,678,061.17/101,978.11
6. Step 6: Final answer
   x = 78,219.51