Finding the Fourth Proportional to 129,521, 178,739.52 and 72,933.32

Step by Step Solution

1. Step 1: Write the proportion equation
   129,521 : 178,739.52 = 72,933.32 : x
2. Step 2: Convert to fraction form
   129,521/178,739.52 = 72,933.32/x
3. Step 3: Cross multiply
   129,521x = 178,739.52 × 72,933.32
4. Step 4: Simplify right side
   129,521x = 13,036,066,608.81
5. Step 5: Solve for x
   x = 13,036,066,608.81/129,521
6. Step 6: Final answer
   x = 100,648.29