Finding the Fourth Proportional to 78,637,141.31, 117,955,649.99 and 21,129,412.55

Step by Step Solution

1. Step 1: Write the proportion equation
   78,637,141.31 : 117,955,649.99 = 21,129,412.55 : x
2. Step 2: Convert to fraction form
   78,637,141.31/117,955,649.99 = 21,129,412.55/x
3. Step 3: Cross multiply
   78,637,141.31x = 117,955,649.99 × 21,129,412.55
4. Step 4: Simplify right side
   78,637,141.31x = 2,492,333,590,705,159
5. Step 5: Solve for x
   x = 2,492,333,590,705,159/78,637,141.31
6. Step 6: Final answer
   x = 31,694,102.17