Finding the Fourth Proportional to 1,670.82, 2,507.72 and 891.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,670.82 : 2,507.72 = 891.48 : x
2. Step 2: Convert to fraction form
   1,670.82/2,507.72 = 891.48/x
3. Step 3: Cross multiply
   1,670.82x = 2,507.72 × 891.48
4. Step 4: Simplify right side
   1,670.82x = 2,235,582.23
5. Step 5: Solve for x
   x = 2,235,582.23/1,670.82
6. Step 6: Final answer
   x = 1,338.02