Finding the Fourth Proportional to 1,212.34, 1,671.69 and 1,026.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.34 : 1,671.69 = 1,026.58 : x
2. Step 2: Convert to fraction form
   1,212.34/1,671.69 = 1,026.58/x
3. Step 3: Cross multiply
   1,212.34x = 1,671.69 × 1,026.58
4. Step 4: Simplify right side
   1,212.34x = 1,716,123.52
5. Step 5: Solve for x
   x = 1,716,123.52/1,212.34
6. Step 6: Final answer
   x = 1,415.55