Finding the Fourth Proportional to 2,607.86, 3,598.90 and 1,428.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.86 : 3,598.90 = 1,428.86 : x
2. Step 2: Convert to fraction form
   2,607.86/3,598.90 = 1,428.86/x
3. Step 3: Cross multiply
   2,607.86x = 3,598.90 × 1,428.86
4. Step 4: Simplify right side
   2,607.86x = 5,142,324.25
5. Step 5: Solve for x
   x = 5,142,324.25/2,607.86
6. Step 6: Final answer
   x = 1,971.86