Finding the Fourth Proportional to 31,385.37, 43,259.76 and 30,554.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,385.37 : 43,259.76 = 30,554.31 : x
2. Step 2: Convert to fraction form
   31,385.37/43,259.76 = 30,554.31/x
3. Step 3: Cross multiply
   31,385.37x = 43,259.76 × 30,554.31
4. Step 4: Simplify right side
   31,385.37x = 1,321,772,117.57
5. Step 5: Solve for x
   x = 1,321,772,117.57/31,385.37
6. Step 6: Final answer
   x = 42,114.28