Finding the Fourth Proportional to 2,602.13, 3,899.75 and 1,870.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.13 : 3,899.75 = 1,870.16 : x
2. Step 2: Convert to fraction form
   2,602.13/3,899.75 = 1,870.16/x
3. Step 3: Cross multiply
   2,602.13x = 3,899.75 × 1,870.16
4. Step 4: Simplify right side
   2,602.13x = 7,293,127.61
5. Step 5: Solve for x
   x = 7,293,127.61/2,602.13
6. Step 6: Final answer
   x = 2,802.76