Finding the Fourth Proportional to 1,139.81, 1,700.76 and 1,070.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.81 : 1,700.76 = 1,070.15 : x
2. Step 2: Convert to fraction form
   1,139.81/1,700.76 = 1,070.15/x
3. Step 3: Cross multiply
   1,139.81x = 1,700.76 × 1,070.15
4. Step 4: Simplify right side
   1,139.81x = 1,820,063.82
5. Step 5: Solve for x
   x = 1,820,063.82/1,139.81
6. Step 6: Final answer
   x = 1,596.82