Finding the Fourth Proportional to 329,111.55, 493,569.47 and 139,569.12

Step by Step Solution

1. Step 1: Write the proportion equation
   329,111.55 : 493,569.47 = 139,569.12 : x
2. Step 2: Convert to fraction form
   329,111.55/493,569.47 = 139,569.12/x
3. Step 3: Cross multiply
   329,111.55x = 493,569.47 × 139,569.12
4. Step 4: Simplify right side
   329,111.55x = 68,887,055,888.92
5. Step 5: Solve for x
   x = 68,887,055,888.92/329,111.55
6. Step 6: Final answer
   x = 209,312.18