Finding the Fourth Proportional to 1,621.61, 2,238.06 and 913.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.61 : 2,238.06 = 913.52 : x
2. Step 2: Convert to fraction form
   1,621.61/2,238.06 = 913.52/x
3. Step 3: Cross multiply
   1,621.61x = 2,238.06 × 913.52
4. Step 4: Simplify right side
   1,621.61x = 2,044,501.38
5. Step 5: Solve for x
   x = 2,044,501.38/1,621.61
6. Step 6: Final answer
   x = 1,260.79