Finding the Fourth Proportional to 1,139.01, 1,706.91 and 906.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.01 : 1,706.91 = 906.87 : x
2. Step 2: Convert to fraction form
   1,139.01/1,706.91 = 906.87/x
3. Step 3: Cross multiply
   1,139.01x = 1,706.91 × 906.87
4. Step 4: Simplify right side
   1,139.01x = 1,547,945.47
5. Step 5: Solve for x
   x = 1,547,945.47/1,139.01
6. Step 6: Final answer
   x = 1,359.03