Finding the Fourth Proportional to 78,042.76, 107,687.42 and 47,399.91

Step by Step Solution

1. Step 1: Write the proportion equation
   78,042.76 : 107,687.42 = 47,399.91 : x
2. Step 2: Convert to fraction form
   78,042.76/107,687.42 = 47,399.91/x
3. Step 3: Cross multiply
   78,042.76x = 107,687.42 × 47,399.91
4. Step 4: Simplify right side
   78,042.76x = 5,104,374,134.63
5. Step 5: Solve for x
   x = 5,104,374,134.63/78,042.76
6. Step 6: Final answer
   x = 65,404.84