Finding the Fourth Proportional to 1,540.72, 2,126.05 and 877.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.72 : 2,126.05 = 877.43 : x
2. Step 2: Convert to fraction form
   1,540.72/2,126.05 = 877.43/x
3. Step 3: Cross multiply
   1,540.72x = 2,126.05 × 877.43
4. Step 4: Simplify right side
   1,540.72x = 1,865,463.17
5. Step 5: Solve for x
   x = 1,865,463.17/1,540.72
6. Step 6: Final answer
   x = 1,210.77