Finding the Fourth Proportional to 1,870.60, 2,807.61 and 946.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.60 : 2,807.61 = 946.78 : x
2. Step 2: Convert to fraction form
   1,870.60/2,807.61 = 946.78/x
3. Step 3: Cross multiply
   1,870.60x = 2,807.61 × 946.78
4. Step 4: Simplify right side
   1,870.60x = 2,658,189.00
5. Step 5: Solve for x
   x = 2,658,189.00/1,870.60
6. Step 6: Final answer
   x = 1,421.04