Finding the Fourth Proportional to 57,039.30, 78,552.09 and 55,818.18

Step by Step Solution

1. Step 1: Write the proportion equation
   57,039.30 : 78,552.09 = 55,818.18 : x
2. Step 2: Convert to fraction form
   57,039.30/78,552.09 = 55,818.18/x
3. Step 3: Cross multiply
   57,039.30x = 78,552.09 × 55,818.18
4. Step 4: Simplify right side
   57,039.30x = 4,384,634,699.00
5. Step 5: Solve for x
   x = 4,384,634,699.00/57,039.30
6. Step 6: Final answer
   x = 76,870.42