Finding the Fourth Proportional to 103,640.45, 155,462.51 and 37,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   103,640.45 : 155,462.51 = 37,128.31 : x
2. Step 2: Convert to fraction form
   103,640.45/155,462.51 = 37,128.31/x
3. Step 3: Cross multiply
   103,640.45x = 155,462.51 × 37,128.31
4. Step 4: Simplify right side
   103,640.45x = 5,772,060,264.66
5. Step 5: Solve for x
   x = 5,772,060,264.66/103,640.45
6. Step 6: Final answer
   x = 55,693.12