Finding the Fourth Proportional to 1,429.76, 1,972.37 and 899.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.76 : 1,972.37 = 899.30 : x
2. Step 2: Convert to fraction form
   1,429.76/1,972.37 = 899.30/x
3. Step 3: Cross multiply
   1,429.76x = 1,972.37 × 899.30
4. Step 4: Simplify right side
   1,429.76x = 1,773,737.98
5. Step 5: Solve for x
   x = 1,773,737.98/1,429.76
6. Step 6: Final answer
   x = 1,240.59