Finding the Fourth Proportional to 78,360, 117,539.76 and 28,440.03

Step by Step Solution

1. Step 1: Write the proportion equation
   78,360 : 117,539.76 = 28,440.03 : x
2. Step 2: Convert to fraction form
   78,360/117,539.76 = 28,440.03/x
3. Step 3: Cross multiply
   78,360x = 117,539.76 × 28,440.03
4. Step 4: Simplify right side
   78,360x = 3,342,834,300.59
5. Step 5: Solve for x
   x = 3,342,834,300.59/78,360
6. Step 6: Final answer
   x = 42,659.96