Finding the Fourth Proportional to 1,870.08, 2,804.57 and 992.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.08 : 2,804.57 = 992.15 : x
2. Step 2: Convert to fraction form
   1,870.08/2,804.57 = 992.15/x
3. Step 3: Cross multiply
   1,870.08x = 2,804.57 × 992.15
4. Step 4: Simplify right side
   1,870.08x = 2,782,535.14
5. Step 5: Solve for x
   x = 2,782,535.14/1,870.08
6. Step 6: Final answer
   x = 1,487.92