Finding the Fourth Proportional to 1,335.59, 1,991.42 and 1,333.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.59 : 1,991.42 = 1,333.76 : x
2. Step 2: Convert to fraction form
   1,335.59/1,991.42 = 1,333.76/x
3. Step 3: Cross multiply
   1,335.59x = 1,991.42 × 1,333.76
4. Step 4: Simplify right side
   1,335.59x = 2,656,076.34
5. Step 5: Solve for x
   x = 2,656,076.34/1,335.59
6. Step 6: Final answer
   x = 1,988.70