Finding the Fourth Proportional to 128,412.56, 177,199.71 and 71,813

Step by Step Solution

1. Step 1: Write the proportion equation
   128,412.56 : 177,199.71 = 71,813 : x
2. Step 2: Convert to fraction form
   128,412.56/177,199.71 = 71,813/x
3. Step 3: Cross multiply
   128,412.56x = 177,199.71 × 71,813
4. Step 4: Simplify right side
   128,412.56x = 12,725,242,774.23
5. Step 5: Solve for x
   x = 12,725,242,774.23/128,412.56
6. Step 6: Final answer
   x = 99,096.56