Finding the Fourth Proportional to 67,300.55, 100,972.25 and 19,915.90

Step by Step Solution

1. Step 1: Write the proportion equation
   67,300.55 : 100,972.25 = 19,915.90 : x
2. Step 2: Convert to fraction form
   67,300.55/100,972.25 = 19,915.90/x
3. Step 3: Cross multiply
   67,300.55x = 100,972.25 × 19,915.90
4. Step 4: Simplify right side
   67,300.55x = 2,010,953,184.42
5. Step 5: Solve for x
   x = 2,010,953,184.42/67,300.55
6. Step 6: Final answer
   x = 29,880.19