Finding the Fourth Proportional to 162,046.30, 243,288.15 and 128,803.90

Step by Step Solution

1. Step 1: Write the proportion equation
   162,046.30 : 243,288.15 = 128,803.90 : x
2. Step 2: Convert to fraction form
   162,046.30/243,288.15 = 128,803.90/x
3. Step 3: Cross multiply
   162,046.30x = 243,288.15 × 128,803.90
4. Step 4: Simplify right side
   162,046.30x = 31,336,462,543.79
5. Step 5: Solve for x
   x = 31,336,462,543.79/162,046.30
6. Step 6: Final answer
   x = 193,379.69