Finding the Fourth Proportional to 1,385.82, 1,915.16 and 1,238.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.82 : 1,915.16 = 1,238.19 : x
2. Step 2: Convert to fraction form
   1,385.82/1,915.16 = 1,238.19/x
3. Step 3: Cross multiply
   1,385.82x = 1,915.16 × 1,238.19
4. Step 4: Simplify right side
   1,385.82x = 2,371,325.77
5. Step 5: Solve for x
   x = 2,371,325.77/1,385.82
6. Step 6: Final answer
   x = 1,711.14