Finding the Fourth Proportional to 422,960.31, 634,606.52 and 186,136.86

Step by Step Solution

1. Step 1: Write the proportion equation
   422,960.31 : 634,606.52 = 186,136.86 : x
2. Step 2: Convert to fraction form
   422,960.31/634,606.52 = 186,136.86/x
3. Step 3: Cross multiply
   422,960.31x = 634,606.52 × 186,136.86
4. Step 4: Simplify right side
   422,960.31x = 118,123,666,417.42
5. Step 5: Solve for x
   x = 118,123,666,417.42/422,960.31
6. Step 6: Final answer
   x = 279,278.37