Finding the Fourth Proportional to 58,688.16, 87,978.96 and 21,239.52

Step by Step Solution

1. Step 1: Write the proportion equation
   58,688.16 : 87,978.96 = 21,239.52 : x
2. Step 2: Convert to fraction form
   58,688.16/87,978.96 = 21,239.52/x
3. Step 3: Cross multiply
   58,688.16x = 87,978.96 × 21,239.52
4. Step 4: Simplify right side
   58,688.16x = 1,868,630,880.50
5. Step 5: Solve for x
   x = 1,868,630,880.50/58,688.16
6. Step 6: Final answer
   x = 31,840.00