Finding the Fourth Proportional to 139,887.72, 209,833.04 and 111,985.16

Step by Step Solution

1. Step 1: Write the proportion equation
   139,887.72 : 209,833.04 = 111,985.16 : x
2. Step 2: Convert to fraction form
   139,887.72/209,833.04 = 111,985.16/x
3. Step 3: Cross multiply
   139,887.72x = 209,833.04 × 111,985.16
4. Step 4: Simplify right side
   139,887.72x = 23,498,186,557.69
5. Step 5: Solve for x
   x = 23,498,186,557.69/139,887.72
6. Step 6: Final answer
   x = 167,978.91