Finding the Fourth Proportional to 78,641.34, 117,845.33 and 57,762.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,641.34 : 117,845.33 = 57,762.78 : x
2. Step 2: Convert to fraction form
   78,641.34/117,845.33 = 57,762.78/x
3. Step 3: Cross multiply
   78,641.34x = 117,845.33 × 57,762.78
4. Step 4: Simplify right side
   78,641.34x = 6,807,073,870.82
5. Step 5: Solve for x
   x = 6,807,073,870.82/78,641.34
6. Step 6: Final answer
   x = 86,558.47