Finding the Fourth Proportional to 108,698.72, 149,935.20 and 78,528.38

Step by Step Solution

1. Step 1: Write the proportion equation
   108,698.72 : 149,935.20 = 78,528.38 : x
2. Step 2: Convert to fraction form
   108,698.72/149,935.20 = 78,528.38/x
3. Step 3: Cross multiply
   108,698.72x = 149,935.20 × 78,528.38
4. Step 4: Simplify right side
   108,698.72x = 11,774,168,360.98
5. Step 5: Solve for x
   x = 11,774,168,360.98/108,698.72
6. Step 6: Final answer
   x = 108,319.29