Finding the Fourth Proportional to 89,007.86, 133,301.30 and 77,257.60

Step by Step Solution

1. Step 1: Write the proportion equation
   89,007.86 : 133,301.30 = 77,257.60 : x
2. Step 2: Convert to fraction form
   89,007.86/133,301.30 = 77,257.60/x
3. Step 3: Cross multiply
   89,007.86x = 133,301.30 × 77,257.60
4. Step 4: Simplify right side
   89,007.86x = 10,298,537,795.34
5. Step 5: Solve for x
   x = 10,298,537,795.34/89,007.86
6. Step 6: Final answer
   x = 115,703.69