Finding the Fourth Proportional to 1,374.72, 1,898.76 and 877.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,374.72 : 1,898.76 = 877.20 : x
2. Step 2: Convert to fraction form
   1,374.72/1,898.76 = 877.20/x
3. Step 3: Cross multiply
   1,374.72x = 1,898.76 × 877.20
4. Step 4: Simplify right side
   1,374.72x = 1,665,592.27
5. Step 5: Solve for x
   x = 1,665,592.27/1,374.72
6. Step 6: Final answer
   x = 1,211.59