Finding the Fourth Proportional to 70,780.79, 106,082.28 and 42,338.72

Step by Step Solution

1. Step 1: Write the proportion equation
   70,780.79 : 106,082.28 = 42,338.72 : x
2. Step 2: Convert to fraction form
   70,780.79/106,082.28 = 42,338.72/x
3. Step 3: Cross multiply
   70,780.79x = 106,082.28 × 42,338.72
4. Step 4: Simplify right side
   70,780.79x = 4,491,387,419.47
5. Step 5: Solve for x
   x = 4,491,387,419.47/70,780.79
6. Step 6: Final answer
   x = 63,454.90