Finding the Fourth Proportional to 1,380.99, 1,906.00 and 883.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.99 : 1,906.00 = 883.60 : x
2. Step 2: Convert to fraction form
   1,380.99/1,906.00 = 883.60/x
3. Step 3: Cross multiply
   1,380.99x = 1,906.00 × 883.60
4. Step 4: Simplify right side
   1,380.99x = 1,684,141.77
5. Step 5: Solve for x
   x = 1,684,141.77/1,380.99
6. Step 6: Final answer
   x = 1,219.52