Finding the Fourth Proportional to 42,965.64, 64,439.89 and 14,499.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,965.64 : 64,439.89 = 14,499.81 : x
2. Step 2: Convert to fraction form
   42,965.64/64,439.89 = 14,499.81/x
3. Step 3: Cross multiply
   42,965.64x = 64,439.89 × 14,499.81
4. Step 4: Simplify right side
   42,965.64x = 934,366,161.42
5. Step 5: Solve for x
   x = 934,366,161.42/42,965.64
6. Step 6: Final answer
   x = 21,746.82