Finding the Fourth Proportional to 55,002.42, 75,903.30 and 31,128.66

Step by Step Solution

1. Step 1: Write the proportion equation
   55,002.42 : 75,903.30 = 31,128.66 : x
2. Step 2: Convert to fraction form
   55,002.42/75,903.30 = 31,128.66/x
3. Step 3: Cross multiply
   55,002.42x = 75,903.30 × 31,128.66
4. Step 4: Simplify right side
   55,002.42x = 2,362,768,018.58
5. Step 5: Solve for x
   x = 2,362,768,018.58/55,002.42
6. Step 6: Final answer
   x = 42,957.53