Finding the Fourth Proportional to 1,385.10, 1,912.01 and 887.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.10 : 1,912.01 = 887.76 : x
2. Step 2: Convert to fraction form
   1,385.10/1,912.01 = 887.76/x
3. Step 3: Cross multiply
   1,385.10x = 1,912.01 × 887.76
4. Step 4: Simplify right side
   1,385.10x = 1,697,401.56
5. Step 5: Solve for x
   x = 1,697,401.56/1,385.10
6. Step 6: Final answer
   x = 1,225.47