Finding the Fourth Proportional to 1,505.39, 2,077.41 and 915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,505.39 : 2,077.41 = 915.50 : x
2. Step 2: Convert to fraction form
   1,505.39/2,077.41 = 915.50/x
3. Step 3: Cross multiply
   1,505.39x = 2,077.41 × 915.50
4. Step 4: Simplify right side
   1,505.39x = 1,901,877.48
5. Step 5: Solve for x
   x = 1,901,877.48/1,505.39
6. Step 6: Final answer
   x = 1,263.38