Finding the Fourth Proportional to 156,920.51, 236,234.62 and 142,970.15

Step by Step Solution

1. Step 1: Write the proportion equation
   156,920.51 : 236,234.62 = 142,970.15 : x
2. Step 2: Convert to fraction form
   156,920.51/236,234.62 = 142,970.15/x
3. Step 3: Cross multiply
   156,920.51x = 236,234.62 × 142,970.15
4. Step 4: Simplify right side
   156,920.51x = 33,774,499,056.59
5. Step 5: Solve for x
   x = 33,774,499,056.59/156,920.51
6. Step 6: Final answer
   x = 215,233.17