Finding the Fourth Proportional to 3,670.15, 5,064.89 and 1,991.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,670.15 : 5,064.89 = 1,991.63 : x
2. Step 2: Convert to fraction form
   3,670.15/5,064.89 = 1,991.63/x
3. Step 3: Cross multiply
   3,670.15x = 5,064.89 × 1,991.63
4. Step 4: Simplify right side
   3,670.15x = 10,087,386.87
5. Step 5: Solve for x
   x = 10,087,386.87/3,670.15
6. Step 6: Final answer
   x = 2,748.49