Finding the Fourth Proportional to 1,442.71, 1,991.89 and 883.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.71 : 1,991.89 = 883.74 : x
2. Step 2: Convert to fraction form
   1,442.71/1,991.89 = 883.74/x
3. Step 3: Cross multiply
   1,442.71x = 1,991.89 × 883.74
4. Step 4: Simplify right side
   1,442.71x = 1,760,312.87
5. Step 5: Solve for x
   x = 1,760,312.87/1,442.71
6. Step 6: Final answer
   x = 1,220.14