Finding the Fourth Proportional to 191,418.90, 287,141.56 and 65,007.57

Step by Step Solution

1. Step 1: Write the proportion equation
   191,418.90 : 287,141.56 = 65,007.57 : x
2. Step 2: Convert to fraction form
   191,418.90/287,141.56 = 65,007.57/x
3. Step 3: Cross multiply
   191,418.90x = 287,141.56 × 65,007.57
4. Step 4: Simplify right side
   191,418.90x = 18,666,375,061.61
5. Step 5: Solve for x
   x = 18,666,375,061.61/191,418.90
6. Step 6: Final answer
   x = 97,515.84