Finding the Fourth Proportional to 85,868.72, 128,840.16 and 46,453.60

Step by Step Solution

1. Step 1: Write the proportion equation
   85,868.72 : 128,840.16 = 46,453.60 : x
2. Step 2: Convert to fraction form
   85,868.72/128,840.16 = 46,453.60/x
3. Step 3: Cross multiply
   85,868.72x = 128,840.16 × 46,453.60
4. Step 4: Simplify right side
   85,868.72x = 5,985,089,256.58
5. Step 5: Solve for x
   x = 5,985,089,256.58/85,868.72
6. Step 6: Final answer
   x = 69,700.46