Finding the Fourth Proportional to 103,755.31, 155,681.57 and 51,136.09

Step by Step Solution

1. Step 1: Write the proportion equation
   103,755.31 : 155,681.57 = 51,136.09 : x
2. Step 2: Convert to fraction form
   103,755.31/155,681.57 = 51,136.09/x
3. Step 3: Cross multiply
   103,755.31x = 155,681.57 × 51,136.09
4. Step 4: Simplify right side
   103,755.31x = 7,960,946,774.86
5. Step 5: Solve for x
   x = 7,960,946,774.86/103,755.31
6. Step 6: Final answer
   x = 76,728.09