Finding the Fourth Proportional to 371,738.72, 557,608.90 and 91,256.78

Step by Step Solution

1. Step 1: Write the proportion equation
   371,738.72 : 557,608.90 = 91,256.78 : x
2. Step 2: Convert to fraction form
   371,738.72/557,608.90 = 91,256.78/x
3. Step 3: Cross multiply
   371,738.72x = 557,608.90 × 91,256.78
4. Step 4: Simplify right side
   371,738.72x = 50,885,592,713.34
5. Step 5: Solve for x
   x = 50,885,592,713.34/371,738.72
6. Step 6: Final answer
   x = 136,885.37