Finding the Fourth Proportional to 81,422.34, 122,320.61 and 57,788.56

Step by Step Solution

1. Step 1: Write the proportion equation
   81,422.34 : 122,320.61 = 57,788.56 : x
2. Step 2: Convert to fraction form
   81,422.34/122,320.61 = 57,788.56/x
3. Step 3: Cross multiply
   81,422.34x = 122,320.61 × 57,788.56
4. Step 4: Simplify right side
   81,422.34x = 7,068,731,910.22
5. Step 5: Solve for x
   x = 7,068,731,910.22/81,422.34
6. Step 6: Final answer
   x = 86,815.63