Finding the Fourth Proportional to 1,139.83, 1,707.62 and 651.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.83 : 1,707.62 = 651.40 : x
2. Step 2: Convert to fraction form
   1,139.83/1,707.62 = 651.40/x
3. Step 3: Cross multiply
   1,139.83x = 1,707.62 × 651.40
4. Step 4: Simplify right side
   1,139.83x = 1,112,331.87
5. Step 5: Solve for x
   x = 1,112,331.87/1,139.83
6. Step 6: Final answer
   x = 975.88