Finding the Fourth Proportional to 1,947.61, 2,687.90 and 1,151.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.61 : 2,687.90 = 1,151.20 : x
2. Step 2: Convert to fraction form
   1,947.61/2,687.90 = 1,151.20/x
3. Step 3: Cross multiply
   1,947.61x = 2,687.90 × 1,151.20
4. Step 4: Simplify right side
   1,947.61x = 3,094,298.00
5. Step 5: Solve for x
   x = 3,094,298.00/1,947.61
6. Step 6: Final answer
   x = 1,588.77