Finding the Fourth Proportional to 35,156.71, 52,742.12 and 12,970.20

Step by Step Solution

1. Step 1: Write the proportion equation
   35,156.71 : 52,742.12 = 12,970.20 : x
2. Step 2: Convert to fraction form
   35,156.71/52,742.12 = 12,970.20/x
3. Step 3: Cross multiply
   35,156.71x = 52,742.12 × 12,970.20
4. Step 4: Simplify right side
   35,156.71x = 684,075,844.82
5. Step 5: Solve for x
   x = 684,075,844.82/35,156.71
6. Step 6: Final answer
   x = 19,457.90