Finding the Fourth Proportional to 58,075.16, 87,112.42 and 21,139.16

Step by Step Solution

1. Step 1: Write the proportion equation
   58,075.16 : 87,112.42 = 21,139.16 : x
2. Step 2: Convert to fraction form
   58,075.16/87,112.42 = 21,139.16/x
3. Step 3: Cross multiply
   58,075.16x = 87,112.42 × 21,139.16
4. Step 4: Simplify right side
   58,075.16x = 1,841,483,384.37
5. Step 5: Solve for x
   x = 1,841,483,384.37/58,075.16
6. Step 6: Final answer
   x = 31,708.62