Finding the Fourth Proportional to 209,066.72, 288,491.27 and 118,404.64

Step by Step Solution

1. Step 1: Write the proportion equation
   209,066.72 : 288,491.27 = 118,404.64 : x
2. Step 2: Convert to fraction form
   209,066.72/288,491.27 = 118,404.64/x
3. Step 3: Cross multiply
   209,066.72x = 288,491.27 × 118,404.64
4. Step 4: Simplify right side
   209,066.72x = 34,158,703,779.35
5. Step 5: Solve for x
   x = 34,158,703,779.35/209,066.72
6. Step 6: Final answer
   x = 163,386.61