Finding the Fourth Proportional to 2,091.31, 2,886.51 and 1,207.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.31 : 2,886.51 = 1,207.47 : x
2. Step 2: Convert to fraction form
   2,091.31/2,886.51 = 1,207.47/x
3. Step 3: Cross multiply
   2,091.31x = 2,886.51 × 1,207.47
4. Step 4: Simplify right side
   2,091.31x = 3,485,374.23
5. Step 5: Solve for x
   x = 3,485,374.23/2,091.31
6. Step 6: Final answer
   x = 1,666.60