Finding the Fourth Proportional to 1,381.34, 2,069.30 and 917.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.34 : 2,069.30 = 917.76 : x
2. Step 2: Convert to fraction form
   1,381.34/2,069.30 = 917.76/x
3. Step 3: Cross multiply
   1,381.34x = 2,069.30 × 917.76
4. Step 4: Simplify right side
   1,381.34x = 1,899,120.77
5. Step 5: Solve for x
   x = 1,899,120.77/1,381.34
6. Step 6: Final answer
   x = 1,374.84