Finding the Fourth Proportional to 78,061.18, 107,720.36 and 45,791.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,061.18 : 107,720.36 = 45,791.31 : x
2. Step 2: Convert to fraction form
   78,061.18/107,720.36 = 45,791.31/x
3. Step 3: Cross multiply
   78,061.18x = 107,720.36 × 45,791.31
4. Step 4: Simplify right side
   78,061.18x = 4,932,656,398.07
5. Step 5: Solve for x
   x = 4,932,656,398.07/78,061.18
6. Step 6: Final answer
   x = 63,189.62