Finding the Fourth Proportional to 78,493.68, 117,483.12 and 42,900.48

Step by Step Solution

1. Step 1: Write the proportion equation
   78,493.68 : 117,483.12 = 42,900.48 : x
2. Step 2: Convert to fraction form
   78,493.68/117,483.12 = 42,900.48/x
3. Step 3: Cross multiply
   78,493.68x = 117,483.12 × 42,900.48
4. Step 4: Simplify right side
   78,493.68x = 5,040,082,239.90
5. Step 5: Solve for x
   x = 5,040,082,239.90/78,493.68
6. Step 6: Final answer
   x = 64,210.04