Finding the Fourth Proportional to 140,215.86, 193,442.55 and 86,407.16

Step by Step Solution

1. Step 1: Write the proportion equation
   140,215.86 : 193,442.55 = 86,407.16 : x
2. Step 2: Convert to fraction form
   140,215.86/193,442.55 = 86,407.16/x
3. Step 3: Cross multiply
   140,215.86x = 193,442.55 × 86,407.16
4. Step 4: Simplify right side
   140,215.86x = 16,714,820,401.45
5. Step 5: Solve for x
   x = 16,714,820,401.45/140,215.86
6. Step 6: Final answer
   x = 119,207.77