Finding the Fourth Proportional to 103,577.51, 155,224.51 and 78,256.20

Step by Step Solution

1. Step 1: Write the proportion equation
   103,577.51 : 155,224.51 = 78,256.20 : x
2. Step 2: Convert to fraction form
   103,577.51/155,224.51 = 78,256.20/x
3. Step 3: Cross multiply
   103,577.51x = 155,224.51 × 78,256.20
4. Step 4: Simplify right side
   103,577.51x = 12,147,280,103.82
5. Step 5: Solve for x
   x = 12,147,280,103.82/103,577.51
6. Step 6: Final answer
   x = 117,277.20