Finding the Fourth Proportional to 78,048, 116,414.40 and 65,421.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,048 : 116,414.40 = 65,421.72 : x
2. Step 2: Convert to fraction form
   78,048/116,414.40 = 65,421.72/x
3. Step 3: Cross multiply
   78,048x = 116,414.40 × 65,421.72
4. Step 4: Simplify right side
   78,048x = 7,616,030,280.77
5. Step 5: Solve for x
   x = 7,616,030,280.77/78,048
6. Step 6: Final answer
   x = 97,581.36