Finding the Fourth Proportional to 1,769.02, 2,440.56 and 1,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,769.02 : 2,440.56 = 1,139.50 : x
2. Step 2: Convert to fraction form
   1,769.02/2,440.56 = 1,139.50/x
3. Step 3: Cross multiply
   1,769.02x = 2,440.56 × 1,139.50
4. Step 4: Simplify right side
   1,769.02x = 2,781,011.72
5. Step 5: Solve for x
   x = 2,781,011.72/1,769.02
6. Step 6: Final answer
   x = 1,572.07