Finding the Fourth Proportional to 1,915.68, 2,870.80 and 803.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.68 : 2,870.80 = 803.89 : x
2. Step 2: Convert to fraction form
   1,915.68/2,870.80 = 803.89/x
3. Step 3: Cross multiply
   1,915.68x = 2,870.80 × 803.89
4. Step 4: Simplify right side
   1,915.68x = 2,307,807.41
5. Step 5: Solve for x
   x = 2,307,807.41/1,915.68
6. Step 6: Final answer
   x = 1,204.69