Finding the Fourth Proportional to 1,488.86, 2,053.12 and 899.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.86 : 2,053.12 = 899.06 : x
2. Step 2: Convert to fraction form
   1,488.86/2,053.12 = 899.06/x
3. Step 3: Cross multiply
   1,488.86x = 2,053.12 × 899.06
4. Step 4: Simplify right side
   1,488.86x = 1,845,878.07
5. Step 5: Solve for x
   x = 1,845,878.07/1,488.86
6. Step 6: Final answer
   x = 1,239.79