Finding the Fourth Proportional to 2,119.61, 2,925.17 and 1,223.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,119.61 : 2,925.17 = 1,223.48 : x
2. Step 2: Convert to fraction form
   2,119.61/2,925.17 = 1,223.48/x
3. Step 3: Cross multiply
   2,119.61x = 2,925.17 × 1,223.48
4. Step 4: Simplify right side
   2,119.61x = 3,578,866.25
5. Step 5: Solve for x
   x = 3,578,866.25/2,119.61
6. Step 6: Final answer
   x = 1,688.46