Finding the Fourth Proportional to 56,978.19, 78,585.08 and 53,158.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,978.19 : 78,585.08 = 53,158.50 : x
2. Step 2: Convert to fraction form
   56,978.19/78,585.08 = 53,158.50/x
3. Step 3: Cross multiply
   56,978.19x = 78,585.08 × 53,158.50
4. Step 4: Simplify right side
   56,978.19x = 4,177,464,709.39
5. Step 5: Solve for x
   x = 4,177,464,709.39/56,978.19
6. Step 6: Final answer
   x = 73,316.91