Finding the Fourth Proportional to 1,038.83, 1,561.88 and 869.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.83 : 1,561.88 = 869.33 : x
2. Step 2: Convert to fraction form
   1,038.83/1,561.88 = 869.33/x
3. Step 3: Cross multiply
   1,038.83x = 1,561.88 × 869.33
4. Step 4: Simplify right side
   1,038.83x = 1,357,795.22
5. Step 5: Solve for x
   x = 1,357,795.22/1,038.83
6. Step 6: Final answer
   x = 1,307.05