Finding the Fourth Proportional to 1,488.16, 2,053.76 and 898.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.16 : 2,053.76 = 898.72 : x
2. Step 2: Convert to fraction form
   1,488.16/2,053.76 = 898.72/x
3. Step 3: Cross multiply
   1,488.16x = 2,053.76 × 898.72
4. Step 4: Simplify right side
   1,488.16x = 1,845,755.19
5. Step 5: Solve for x
   x = 1,845,755.19/1,488.16
6. Step 6: Final answer
   x = 1,240.29