Finding the Fourth Proportional to 72,384.48, 99,755.28 and 56,443.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,384.48 : 99,755.28 = 56,443.68 : x
2. Step 2: Convert to fraction form
   72,384.48/99,755.28 = 56,443.68/x
3. Step 3: Cross multiply
   72,384.48x = 99,755.28 × 56,443.68
4. Step 4: Simplify right side
   72,384.48x = 5,630,555,102.63
5. Step 5: Solve for x
   x = 5,630,555,102.63/72,384.48
6. Step 6: Final answer
   x = 77,786.77