Finding the Fourth Proportional to 1,870.13, 2,577.90 and 1,397.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.13 : 2,577.90 = 1,397.30 : x
2. Step 2: Convert to fraction form
   1,870.13/2,577.90 = 1,397.30/x
3. Step 3: Cross multiply
   1,870.13x = 2,577.90 × 1,397.30
4. Step 4: Simplify right side
   1,870.13x = 3,602,099.67
5. Step 5: Solve for x
   x = 3,602,099.67/1,870.13
6. Step 6: Final answer
   x = 1,926.12