Finding the Fourth Proportional to 112,493.80, 155,271.78 and 64,762.60

Step by Step Solution

1. Step 1: Write the proportion equation
   112,493.80 : 155,271.78 = 64,762.60 : x
2. Step 2: Convert to fraction form
   112,493.80/155,271.78 = 64,762.60/x
3. Step 3: Cross multiply
   112,493.80x = 155,271.78 × 64,762.60
4. Step 4: Simplify right side
   112,493.80x = 10,055,804,179.43
5. Step 5: Solve for x
   x = 10,055,804,179.43/112,493.80
6. Step 6: Final answer
   x = 89,389.85