Finding the Fourth Proportional to 92,856.76, 139,308.70 and 42,972.78

Step by Step Solution

1. Step 1: Write the proportion equation
   92,856.76 : 139,308.70 = 42,972.78 : x
2. Step 2: Convert to fraction form
   92,856.76/139,308.70 = 42,972.78/x
3. Step 3: Cross multiply
   92,856.76x = 139,308.70 × 42,972.78
4. Step 4: Simplify right side
   92,856.76x = 5,986,482,117.19
5. Step 5: Solve for x
   x = 5,986,482,117.19/92,856.76
6. Step 6: Final answer
   x = 64,470.07