Finding the Fourth Proportional to 93,139.38, 128,682.90 and 64,970.82

Step by Step Solution

1. Step 1: Write the proportion equation
   93,139.38 : 128,682.90 = 64,970.82 : x
2. Step 2: Convert to fraction form
   93,139.38/128,682.90 = 64,970.82/x
3. Step 3: Cross multiply
   93,139.38x = 128,682.90 × 64,970.82
4. Step 4: Simplify right side
   93,139.38x = 8,360,633,532.98
5. Step 5: Solve for x
   x = 8,360,633,532.98/93,139.38
6. Step 6: Final answer
   x = 89,764.75