Finding the Fourth Proportional to 99,686, 149,561.40 and 69,731.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99,686 : 149,561.40 = 69,731.12 : x
2. Step 2: Convert to fraction form
   99,686/149,561.40 = 69,731.12/x
3. Step 3: Cross multiply
   99,686x = 149,561.40 × 69,731.12
4. Step 4: Simplify right side
   99,686x = 10,429,083,930.77
5. Step 5: Solve for x
   x = 10,429,083,930.77/99,686
6. Step 6: Final answer
   x = 104,619.34