Finding the Fourth Proportional to 104,100.78, 143,658.43 and 56,353.78

Step by Step Solution

1. Step 1: Write the proportion equation
   104,100.78 : 143,658.43 = 56,353.78 : x
2. Step 2: Convert to fraction form
   104,100.78/143,658.43 = 56,353.78/x
3. Step 3: Cross multiply
   104,100.78x = 143,658.43 × 56,353.78
4. Step 4: Simplify right side
   104,100.78x = 8,095,695,598.05
5. Step 5: Solve for x
   x = 8,095,695,598.05/104,100.78
6. Step 6: Final answer
   x = 77,767.87