Finding the Fourth Proportional to 1,439.18, 1,981.27 and 1,373.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.18 : 1,981.27 = 1,373.06 : x
2. Step 2: Convert to fraction form
   1,439.18/1,981.27 = 1,373.06/x
3. Step 3: Cross multiply
   1,439.18x = 1,981.27 × 1,373.06
4. Step 4: Simplify right side
   1,439.18x = 2,720,385.81
5. Step 5: Solve for x
   x = 2,720,385.81/1,439.18
6. Step 6: Final answer
   x = 1,890.23