Finding the Fourth Proportional to 1,671.81, 2,307.06 and 915.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,671.81 : 2,307.06 = 915.59 : x
2. Step 2: Convert to fraction form
   1,671.81/2,307.06 = 915.59/x
3. Step 3: Cross multiply
   1,671.81x = 2,307.06 × 915.59
4. Step 4: Simplify right side
   1,671.81x = 2,112,320.34
5. Step 5: Solve for x
   x = 2,112,320.34/1,671.81
6. Step 6: Final answer
   x = 1,263.49