Finding the Fourth Proportional to 1,914.21, 2,870.71 and 615.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.21 : 2,870.71 = 615.38 : x
2. Step 2: Convert to fraction form
   1,914.21/2,870.71 = 615.38/x
3. Step 3: Cross multiply
   1,914.21x = 2,870.71 × 615.38
4. Step 4: Simplify right side
   1,914.21x = 1,766,561.63
5. Step 5: Solve for x
   x = 1,766,561.63/1,914.21
6. Step 6: Final answer
   x = 922.87