Finding the Fourth Proportional to 2,199.31, 3,298.93 and 899.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,199.31 : 3,298.93 = 899.86 : x
2. Step 2: Convert to fraction form
   2,199.31/3,298.93 = 899.86/x
3. Step 3: Cross multiply
   2,199.31x = 3,298.93 × 899.86
4. Step 4: Simplify right side
   2,199.31x = 2,968,575.15
5. Step 5: Solve for x
   x = 2,968,575.15/2,199.31
6. Step 6: Final answer
   x = 1,349.78