Finding the Fourth Proportional to 78,453.78, 108,261.72 and 42,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,453.78 : 108,261.72 = 42,643.50 : x
2. Step 2: Convert to fraction form
   78,453.78/108,261.72 = 42,643.50/x
3. Step 3: Cross multiply
   78,453.78x = 108,261.72 × 42,643.50
4. Step 4: Simplify right side
   78,453.78x = 4,616,658,656.82
5. Step 5: Solve for x
   x = 4,616,658,656.82/78,453.78
6. Step 6: Final answer
   x = 58,845.59