Finding the Fourth Proportional to 1,770.51, 2,442.20 and 1,139.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,770.51 : 2,442.20 = 1,139.99 : x
2. Step 2: Convert to fraction form
   1,770.51/2,442.20 = 1,139.99/x
3. Step 3: Cross multiply
   1,770.51x = 2,442.20 × 1,139.99
4. Step 4: Simplify right side
   1,770.51x = 2,784,065.67
5. Step 5: Solve for x
   x = 2,784,065.67/1,770.51
6. Step 6: Final answer
   x = 1,572.47