Finding the Fourth Proportional to 55,128.34, 76,074.79 and 31,256.62

Step by Step Solution

1. Step 1: Write the proportion equation
   55,128.34 : 76,074.79 = 31,256.62 : x
2. Step 2: Convert to fraction form
   55,128.34/76,074.79 = 31,256.62/x
3. Step 3: Cross multiply
   55,128.34x = 76,074.79 × 31,256.62
4. Step 4: Simplify right side
   55,128.34x = 2,377,840,802.61
5. Step 5: Solve for x
   x = 2,377,840,802.61/55,128.34
6. Step 6: Final answer
   x = 43,132.82