Finding the Fourth Proportional to 156,510.47, 234,240.82 and 128,429.39

Step by Step Solution

1. Step 1: Write the proportion equation
   156,510.47 : 234,240.82 = 128,429.39 : x
2. Step 2: Convert to fraction form
   156,510.47/234,240.82 = 128,429.39/x
3. Step 3: Cross multiply
   156,510.47x = 234,240.82 × 128,429.39
4. Step 4: Simplify right side
   156,510.47x = 30,083,405,625.70
5. Step 5: Solve for x
   x = 30,083,405,625.70/156,510.47
6. Step 6: Final answer
   x = 192,213.37