Finding the Fourth Proportional to 1,820.42, 2,512.05 and 1,428.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.42 : 2,512.05 = 1,428.38 : x
2. Step 2: Convert to fraction form
   1,820.42/2,512.05 = 1,428.38/x
3. Step 3: Cross multiply
   1,820.42x = 2,512.05 × 1,428.38
4. Step 4: Simplify right side
   1,820.42x = 3,588,161.98
5. Step 5: Solve for x
   x = 3,588,161.98/1,820.42
6. Step 6: Final answer
   x = 1,971.06