Finding the Fourth Proportional to 128,302.72, 177,050.61 and 70,938.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,302.72 : 177,050.61 = 70,938.72 : x
2. Step 2: Convert to fraction form
   128,302.72/177,050.61 = 70,938.72/x
3. Step 3: Cross multiply
   128,302.72x = 177,050.61 × 70,938.72
4. Step 4: Simplify right side
   128,302.72x = 12,559,742,763.37
5. Step 5: Solve for x
   x = 12,559,742,763.37/128,302.72
6. Step 6: Final answer
   x = 97,891.48