Finding the Fourth Proportional to 42,762.86, 64,100.55 and 21,663.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,762.86 : 64,100.55 = 21,663.80 : x
2. Step 2: Convert to fraction form
   42,762.86/64,100.55 = 21,663.80/x
3. Step 3: Cross multiply
   42,762.86x = 64,100.55 × 21,663.80
4. Step 4: Simplify right side
   42,762.86x = 1,388,661,495.09
5. Step 5: Solve for x
   x = 1,388,661,495.09/42,762.86
6. Step 6: Final answer
   x = 32,473.54