Finding the Fourth Proportional to 1,380.59, 1,903.23 and 986.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.59 : 1,903.23 = 986.93 : x
2. Step 2: Convert to fraction form
   1,380.59/1,903.23 = 986.93/x
3. Step 3: Cross multiply
   1,380.59x = 1,903.23 × 986.93
4. Step 4: Simplify right side
   1,380.59x = 1,878,363.11
5. Step 5: Solve for x
   x = 1,878,363.11/1,380.59
6. Step 6: Final answer
   x = 1,360.55