Finding the Fourth Proportional to 409,308.31, 614,045.51 and 128,760.31

Step by Step Solution

1. Step 1: Write the proportion equation
   409,308.31 : 614,045.51 = 128,760.31 : x
2. Step 2: Convert to fraction form
   409,308.31/614,045.51 = 128,760.31/x
3. Step 3: Cross multiply
   409,308.31x = 614,045.51 × 128,760.31
4. Step 4: Simplify right side
   409,308.31x = 79,064,689,577.91
5. Step 5: Solve for x
   x = 79,064,689,577.91/409,308.31
6. Step 6: Final answer
   x = 193,166.59