Finding the Fourth Proportional to 42,866.64, 64,299.92 and 19,499.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,866.64 : 64,299.92 = 19,499.76 : x
2. Step 2: Convert to fraction form
   42,866.64/64,299.92 = 19,499.76/x
3. Step 3: Cross multiply
   42,866.64x = 64,299.92 × 19,499.76
4. Step 4: Simplify right side
   42,866.64x = 1,253,833,008.02
5. Step 5: Solve for x
   x = 1,253,833,008.02/42,866.64
6. Step 6: Final answer
   x = 29,249.62