Finding the Fourth Proportional to 42,664.66, 64,018.59 and 28,784.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,664.66 : 64,018.59 = 28,784.50 : x
2. Step 2: Convert to fraction form
   42,664.66/64,018.59 = 28,784.50/x
3. Step 3: Cross multiply
   42,664.66x = 64,018.59 × 28,784.50
4. Step 4: Simplify right side
   42,664.66x = 1,842,743,103.86
5. Step 5: Solve for x
   x = 1,842,743,103.86/42,664.66
6. Step 6: Final answer
   x = 43,191.32