Finding the Fourth Proportional to 141,709.89, 212,663.12 and 91,665.39

Step by Step Solution

1. Step 1: Write the proportion equation
   141,709.89 : 212,663.12 = 91,665.39 : x
2. Step 2: Convert to fraction form
   141,709.89/212,663.12 = 91,665.39/x
3. Step 3: Cross multiply
   141,709.89x = 212,663.12 × 91,665.39
4. Step 4: Simplify right side
   141,709.89x = 19,493,847,375.09
5. Step 5: Solve for x
   x = 19,493,847,375.09/141,709.89
6. Step 6: Final answer
   x = 137,561.66