Finding the Fourth Proportional to 57,648.78, 79,555.35 and 31,152.78

Step by Step Solution

1. Step 1: Write the proportion equation
   57,648.78 : 79,555.35 = 31,152.78 : x
2. Step 2: Convert to fraction form
   57,648.78/79,555.35 = 31,152.78/x
3. Step 3: Cross multiply
   57,648.78x = 79,555.35 × 31,152.78
4. Step 4: Simplify right side
   57,648.78x = 2,478,370,316.37
5. Step 5: Solve for x
   x = 2,478,370,316.37/57,648.78
6. Step 6: Final answer
   x = 42,990.85