Finding the Fourth Proportional to 128,337.78, 177,113.88 and 71,749.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128,337.78 : 177,113.88 = 71,749.56 : x
2. Step 2: Convert to fraction form
   128,337.78/177,113.88 = 71,749.56/x
3. Step 3: Cross multiply
   128,337.78x = 177,113.88 × 71,749.56
4. Step 4: Simplify right side
   128,337.78x = 12,707,842,959.89
5. Step 5: Solve for x
   x = 12,707,842,959.89/128,337.78
6. Step 6: Final answer
   x = 99,018.72