Finding the Fourth Proportional to 76,912.70, 106,139.56 and 42,457.46

Step by Step Solution

1. Step 1: Write the proportion equation
   76,912.70 : 106,139.56 = 42,457.46 : x
2. Step 2: Convert to fraction form
   76,912.70/106,139.56 = 42,457.46/x
3. Step 3: Cross multiply
   76,912.70x = 106,139.56 × 42,457.46
4. Step 4: Simplify right side
   76,912.70x = 4,506,416,123.12
5. Step 5: Solve for x
   x = 4,506,416,123.12/76,912.70
6. Step 6: Final answer
   x = 58,591.31