Finding the Fourth Proportional to 78,538.47, 116,919.42 and 78,071.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,538.47 : 116,919.42 = 78,071.40 : x
2. Step 2: Convert to fraction form
   78,538.47/116,919.42 = 78,071.40/x
3. Step 3: Cross multiply
   78,538.47x = 116,919.42 × 78,071.40
4. Step 4: Simplify right side
   78,538.47x = 9,128,062,806.59
5. Step 5: Solve for x
   x = 9,128,062,806.59/78,538.47
6. Step 6: Final answer
   x = 116,224.10