Finding the Fourth Proportional to 42,764.86, 64,157.73 and 30,139.23

Step by Step Solution

1. Step 1: Write the proportion equation
   42,764.86 : 64,157.73 = 30,139.23 : x
2. Step 2: Convert to fraction form
   42,764.86/64,157.73 = 30,139.23/x
3. Step 3: Cross multiply
   42,764.86x = 64,157.73 × 30,139.23
4. Step 4: Simplify right side
   42,764.86x = 1,933,664,580.75
5. Step 5: Solve for x
   x = 1,933,664,580.75/42,764.86
6. Step 6: Final answer
   x = 45,216.20