Finding the Fourth Proportional to 118,570.55, 163,625.06 and 64,855.40

Step by Step Solution

1. Step 1: Write the proportion equation
   118,570.55 : 163,625.06 = 64,855.40 : x
2. Step 2: Convert to fraction form
   118,570.55/163,625.06 = 64,855.40/x
3. Step 3: Cross multiply
   118,570.55x = 163,625.06 × 64,855.40
4. Step 4: Simplify right side
   118,570.55x = 10,611,968,060.34
5. Step 5: Solve for x
   x = 10,611,968,060.34/118,570.55
6. Step 6: Final answer
   x = 89,499.19