Finding the Fourth Proportional to 128,475.18, 177,300.72 and 71,885.34

Step by Step Solution

1. Step 1: Write the proportion equation
   128,475.18 : 177,300.72 = 71,885.34 : x
2. Step 2: Convert to fraction form
   128,475.18/177,300.72 = 71,885.34/x
3. Step 3: Cross multiply
   128,475.18x = 177,300.72 × 71,885.34
4. Step 4: Simplify right side
   128,475.18x = 12,745,322,539.44
5. Step 5: Solve for x
   x = 12,745,322,539.44/128,475.18
6. Step 6: Final answer
   x = 99,204.55