Finding the Fourth Proportional to 81,418.71, 122,315.18 and 57,784.94

Step by Step Solution

1. Step 1: Write the proportion equation
   81,418.71 : 122,315.18 = 57,784.94 : x
2. Step 2: Convert to fraction form
   81,418.71/122,315.18 = 57,784.94/x
3. Step 3: Cross multiply
   81,418.71x = 122,315.18 × 57,784.94
4. Step 4: Simplify right side
   81,418.71x = 7,067,974,436.89
5. Step 5: Solve for x
   x = 7,067,974,436.89/81,418.71
6. Step 6: Final answer
   x = 86,810.20