Finding the Fourth Proportional to 21,192.55, 31,915.73 and 19,300.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,192.55 : 31,915.73 = 19,300.86 : x
2. Step 2: Convert to fraction form
   21,192.55/31,915.73 = 19,300.86/x
3. Step 3: Cross multiply
   21,192.55x = 31,915.73 × 19,300.86
4. Step 4: Simplify right side
   21,192.55x = 616,001,084.78
5. Step 5: Solve for x
   x = 616,001,084.78/21,192.55
6. Step 6: Final answer
   x = 29,066.87