Finding the Fourth Proportional to 92,726.42, 139,040.22 and 42,780.74

Step by Step Solution

1. Step 1: Write the proportion equation
   92,726.42 : 139,040.22 = 42,780.74 : x
2. Step 2: Convert to fraction form
   92,726.42/139,040.22 = 42,780.74/x
3. Step 3: Cross multiply
   92,726.42x = 139,040.22 × 42,780.74
4. Step 4: Simplify right side
   92,726.42x = 5,948,243,501.36
5. Step 5: Solve for x
   x = 5,948,243,501.36/92,726.42
6. Step 6: Final answer
   x = 64,148.31