Finding the Fourth Proportional to 75,663, 104,415.66 and 42,129.72

Step by Step Solution

1. Step 1: Write the proportion equation
   75,663 : 104,415.66 = 42,129.72 : x
2. Step 2: Convert to fraction form
   75,663/104,415.66 = 42,129.72/x
3. Step 3: Cross multiply
   75,663x = 104,415.66 × 42,129.72
4. Step 4: Simplify right side
   75,663x = 4,399,002,519.42
5. Step 5: Solve for x
   x = 4,399,002,519.42/75,663
6. Step 6: Final answer
   x = 58,139.41