Finding the Fourth Proportional to 118,196.20, 177,002.70 and 78,538.60

Step by Step Solution

1. Step 1: Write the proportion equation
   118,196.20 : 177,002.70 = 78,538.60 : x
2. Step 2: Convert to fraction form
   118,196.20/177,002.70 = 78,538.60/x
3. Step 3: Cross multiply
   118,196.20x = 177,002.70 × 78,538.60
4. Step 4: Simplify right side
   118,196.20x = 13,901,544,254.22
5. Step 5: Solve for x
   x = 13,901,544,254.22/118,196.20
6. Step 6: Final answer
   x = 117,614.14