Finding the Fourth Proportional to 72,906, 99,954.12 and 71,577.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,906 : 99,954.12 = 71,577.40 : x
2. Step 2: Convert to fraction form
   72,906/99,954.12 = 71,577.40/x
3. Step 3: Cross multiply
   72,906x = 99,954.12 × 71,577.40
4. Step 4: Simplify right side
   72,906x = 7,154,456,028.89
5. Step 5: Solve for x
   x = 7,154,456,028.89/72,906
6. Step 6: Final answer
   x = 98,132.61