Finding the Fourth Proportional to 78,216.15, 107,938.80 and 42,406.71

Step by Step Solution

1. Step 1: Write the proportion equation
   78,216.15 : 107,938.80 = 42,406.71 : x
2. Step 2: Convert to fraction form
   78,216.15/107,938.80 = 42,406.71/x
3. Step 3: Cross multiply
   78,216.15x = 107,938.80 × 42,406.71
4. Step 4: Simplify right side
   78,216.15x = 4,577,329,389.35
5. Step 5: Solve for x
   x = 4,577,329,389.35/78,216.15
6. Step 6: Final answer
   x = 58,521.54