Finding the Fourth Proportional to 291,915.60, 438,046.34 and 123,426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   291,915.60 : 438,046.34 = 123,426.72 : x
2. Step 2: Convert to fraction form
   291,915.60/438,046.34 = 123,426.72/x
3. Step 3: Cross multiply
   291,915.60x = 438,046.34 × 123,426.72
4. Step 4: Simplify right side
   291,915.60x = 54,066,622,954.20
5. Step 5: Solve for x
   x = 54,066,622,954.20/291,915.60
6. Step 6: Final answer
   x = 185,213.20