Finding the Fourth Proportional to 209,111.88, 288,564.90 and 118,465.80

Step by Step Solution

1. Step 1: Write the proportion equation
   209,111.88 : 288,564.90 = 118,465.80 : x
2. Step 2: Convert to fraction form
   209,111.88/288,564.90 = 118,465.80/x
3. Step 3: Cross multiply
   209,111.88x = 288,564.90 × 118,465.80
4. Step 4: Simplify right side
   209,111.88x = 34,185,071,730.42
5. Step 5: Solve for x
   x = 34,185,071,730.42/209,111.88
6. Step 6: Final answer
   x = 163,477.43