Finding the Fourth Proportional to 2,602.50, 3,901.58 and 1,215.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.50 : 3,901.58 = 1,215.12 : x
2. Step 2: Convert to fraction form
   2,602.50/3,901.58 = 1,215.12/x
3. Step 3: Cross multiply
   2,602.50x = 3,901.58 × 1,215.12
4. Step 4: Simplify right side
   2,602.50x = 4,740,887.89
5. Step 5: Solve for x
   x = 4,740,887.89/2,602.50
6. Step 6: Final answer
   x = 1,821.67