Finding the Fourth Proportional to 209,644.72, 314,390.94 and 91,287.52

Step by Step Solution

1. Step 1: Write the proportion equation
   209,644.72 : 314,390.94 = 91,287.52 : x
2. Step 2: Convert to fraction form
   209,644.72/314,390.94 = 91,287.52/x
3. Step 3: Cross multiply
   209,644.72x = 314,390.94 × 91,287.52
4. Step 4: Simplify right side
   209,644.72x = 28,699,969,223.07
5. Step 5: Solve for x
   x = 28,699,969,223.07/209,644.72
6. Step 6: Final answer
   x = 136,898.13