Finding the Fourth Proportional to 1,670.76, 2,510.69 and 891.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,670.76 : 2,510.69 = 891.32 : x
2. Step 2: Convert to fraction form
   1,670.76/2,510.69 = 891.32/x
3. Step 3: Cross multiply
   1,670.76x = 2,510.69 × 891.32
4. Step 4: Simplify right side
   1,670.76x = 2,237,811.20
5. Step 5: Solve for x
   x = 2,237,811.20/1,670.76
6. Step 6: Final answer
   x = 1,339.40