Finding the Fourth Proportional to 56,610.15, 78,039.67 and 39,561.47

Step by Step Solution

1. Step 1: Write the proportion equation
   56,610.15 : 78,039.67 = 39,561.47 : x
2. Step 2: Convert to fraction form
   56,610.15/78,039.67 = 39,561.47/x
3. Step 3: Cross multiply
   56,610.15x = 78,039.67 × 39,561.47
4. Step 4: Simplify right side
   56,610.15x = 3,087,364,063.51
5. Step 5: Solve for x
   x = 3,087,364,063.51/56,610.15
6. Step 6: Final answer
   x = 54,537.29