Finding the Fourth Proportional to 55,321, 76,345.68 and 31,129.52

Step by Step Solution

1. Step 1: Write the proportion equation
   55,321 : 76,345.68 = 31,129.52 : x
2. Step 2: Convert to fraction form
   55,321/76,345.68 = 31,129.52/x
3. Step 3: Cross multiply
   55,321x = 76,345.68 × 31,129.52
4. Step 4: Simplify right side
   55,321x = 2,376,604,372.47
5. Step 5: Solve for x
   x = 2,376,604,372.47/55,321
6. Step 6: Final answer
   x = 42,960.26