Finding the Fourth Proportional to 1,778.13, 2,667.90 and 900.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,778.13 : 2,667.90 = 900.15 : x
2. Step 2: Convert to fraction form
   1,778.13/2,667.90 = 900.15/x
3. Step 3: Cross multiply
   1,778.13x = 2,667.90 × 900.15
4. Step 4: Simplify right side
   1,778.13x = 2,401,510.19
5. Step 5: Solve for x
   x = 2,401,510.19/1,778.13
6. Step 6: Final answer
   x = 1,350.58