Finding the Fourth Proportional to 139,672.72, 192,973.86 and 97,419.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,672.72 : 192,973.86 = 97,419.88 : x
2. Step 2: Convert to fraction form
   139,672.72/192,973.86 = 97,419.88/x
3. Step 3: Cross multiply
   139,672.72x = 192,973.86 × 97,419.88
4. Step 4: Simplify right side
   139,672.72x = 18,799,490,284.34
5. Step 5: Solve for x
   x = 18,799,490,284.34/139,672.72
6. Step 6: Final answer
   x = 134,596.72