Finding the Fourth Proportional to 1,526.40, 2,279.52 and 1,212.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,526.40 : 2,279.52 = 1,212.12 : x
2. Step 2: Convert to fraction form
   1,526.40/2,279.52 = 1,212.12/x
3. Step 3: Cross multiply
   1,526.40x = 2,279.52 × 1,212.12
4. Step 4: Simplify right side
   1,526.40x = 2,763,051.78
5. Step 5: Solve for x
   x = 2,763,051.78/1,526.40
6. Step 6: Final answer
   x = 1,810.18