Finding the Fourth Proportional to 42,898.28, 64,333.58 and 40,099.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,898.28 : 64,333.58 = 40,099.59 : x
2. Step 2: Convert to fraction form
   42,898.28/64,333.58 = 40,099.59/x
3. Step 3: Cross multiply
   42,898.28x = 64,333.58 × 40,099.59
4. Step 4: Simplify right side
   42,898.28x = 2,579,749,980.73
5. Step 5: Solve for x
   x = 2,579,749,980.73/42,898.28
6. Step 6: Final answer
   x = 60,136.45