Finding the Fourth Proportional to 106,702.55, 147,078.47 and 72,236.42

Step by Step Solution

1. Step 1: Write the proportion equation
   106,702.55 : 147,078.47 = 72,236.42 : x
2. Step 2: Convert to fraction form
   106,702.55/147,078.47 = 72,236.42/x
3. Step 3: Cross multiply
   106,702.55x = 147,078.47 × 72,236.42
4. Step 4: Simplify right side
   106,702.55x = 10,624,422,131.88
5. Step 5: Solve for x
   x = 10,624,422,131.88/106,702.55
6. Step 6: Final answer
   x = 99,570.46