Finding the Fourth Proportional to 1,395.77, 1,925.78 and 899.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.77 : 1,925.78 = 899.10 : x
2. Step 2: Convert to fraction form
   1,395.77/1,925.78 = 899.10/x
3. Step 3: Cross multiply
   1,395.77x = 1,925.78 × 899.10
4. Step 4: Simplify right side
   1,395.77x = 1,731,464.30
5. Step 5: Solve for x
   x = 1,731,464.30/1,395.77
6. Step 6: Final answer
   x = 1,240.51