Finding the Fourth Proportional to 375,496.43, 563,239.78 and 91,189.31

Step by Step Solution

1. Step 1: Write the proportion equation
   375,496.43 : 563,239.78 = 91,189.31 : x
2. Step 2: Convert to fraction form
   375,496.43/563,239.78 = 91,189.31/x
3. Step 3: Cross multiply
   375,496.43x = 563,239.78 × 91,189.31
4. Step 4: Simplify right side
   375,496.43x = 51,361,443,858.58
5. Step 5: Solve for x
   x = 51,361,443,858.58/375,496.43
6. Step 6: Final answer
   x = 136,782.78