Finding the Fourth Proportional to 42,900.28, 64,336.58 and 40,101.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,900.28 : 64,336.58 = 40,101.60 : x
2. Step 2: Convert to fraction form
   42,900.28/64,336.58 = 40,101.60/x
3. Step 3: Cross multiply
   42,900.28x = 64,336.58 × 40,101.60
4. Step 4: Simplify right side
   42,900.28x = 2,579,999,796.53
5. Step 5: Solve for x
   x = 2,579,999,796.53/42,900.28
6. Step 6: Final answer
   x = 60,139.46