Finding the Fourth Proportional to 89,591.78, 123,611.01 and 57,778.94

Step by Step Solution

1. Step 1: Write the proportion equation
   89,591.78 : 123,611.01 = 57,778.94 : x
2. Step 2: Convert to fraction form
   89,591.78/123,611.01 = 57,778.94/x
3. Step 3: Cross multiply
   89,591.78x = 123,611.01 × 57,778.94
4. Step 4: Simplify right side
   89,591.78x = 7,142,113,130.13
5. Step 5: Solve for x
   x = 7,142,113,130.13/89,591.78
6. Step 6: Final answer
   x = 79,718.40