Finding the Fourth Proportional to 74,807.61, 103,238.45 and 42,978.57

Step by Step Solution

1. Step 1: Write the proportion equation
   74,807.61 : 103,238.45 = 42,978.57 : x
2. Step 2: Convert to fraction form
   74,807.61/103,238.45 = 42,978.57/x
3. Step 3: Cross multiply
   74,807.61x = 103,238.45 × 42,978.57
4. Step 4: Simplify right side
   74,807.61x = 4,437,040,950.02
5. Step 5: Solve for x
   x = 4,437,040,950.02/74,807.61
6. Step 6: Final answer
   x = 59,312.69